如何在scapy中创建自定义的顶级二层头部？

from scapy.packet import Packet
from scapy.fields import BitField, MACField

class MyLayer2Header(Packet):
    name = "MyLayer2Header"
    fields_desc = [
        MACField("src", "00:00:00:00:00:00"),
        MACField("dst", "00:00:00:00:00:00"),
        BitField("type", 0, 16)
    ]

    def __init__(self, src="00:00:00:00:00:00", dst="00:00:00:00:00:00", type=0, **kwargs):
        super().__init__(**kwargs)
        self.src = src
        self.dst = dst
        self.type = type

    def build(self):
        return self.src + self.dst + self.type.to_bytes(2, byteorder="big")

    def extract_padding(self, p):
        return b"", p

# 创建自定义二层头部对象
my_header = MyLayer2Header(src="00:11:22:33:44:55", dst="aa:bb:cc:dd:ee:ff", type=0x0800)

# 发送数据包
sendp(Ether() / my_header / IP() / TCP())